Fig. 4
From: Novel distance-progesterone-combined selection approach improves human sperm quality
Effect of selection combined-distance-progesterone on sperm morphology. a Part of sperm morphology: 1, normal; 2–7, abnormal. The bar represents 5 μm. b The percentage of sperm with normal morphology after different treatments. Data are expressed as mean ± SEM. There was a significant difference between D2 and E2 (paired t test, P = 0.017, n = 19), and no significant difference between Non_Percoll and Percoll (P = 0.171, n = 28). Non_Percoll indicates the sperm were not processed by Percoll before selection; Percoll, the sperm were processed by Percoll before selection; D2 and E2, position of device. Min, minutes; P, P value